Air-heating appliance



Jan. 7, 1930.

1 A DERBY' AIR HEATING APPLIANCE Filed Jari. 2. 1929 L Patented Jan. 7,1930 PATENT ola-FICE LLOYD A. DERBY, 0F ADRIAN, MICHIGAN AIB-HEATINGAPPLIANCE Application filed January 2, 1929. Serial No. 329,906.

This invention relates to air heating appliances, and more particularlyto an apparatus of this character providing a convenient source ofheated air under pressure which is portable and accordingly may beemployed to great advantage in garages, in thawing frozen pipes ormelting grease in transmissions, diHerentials, joints or the like torender the same fluid and enable its ready removal.

An important object of the invention is to produce a device of thischaracter which may be readily and cheaply manufactured, which will bedurable and efficient in service and a general improvement in the art.

These and other objects I attain by the con'- struction shown in theaccompanying drawings, wherein for the purpose of illustration is showna preferred embodiment of my invention and wherein Figure 1 is an endelevation of a heater constructed in accordance with my inven-y tion;

Figure 2 is asection on the line 2-2 of Figure 1;

Figure 3 isa fragmentary section at right an les -to theA view of Figure2.

eferring now more particularly to the drawings, the heater comprises a@cylindrical casing 10 having its ends closed by heads 11 and 12. Thecasing 10 comprises inner and outer metallic wall elements 13 and 14having disposed therebetween an insulating lining, such as asbestos 15.Each head 11 and 12 is provided at one side with an ear 16 terminatingin spaced relation to the'wall of the cylinder and each head has vasocket 17 receivin the ends of the wall of the cylinder.

Wit 'n each socket 17 is disposed an asbestos pad 18, lthe pad of thehead 11 bein held in position by engagement of the en of'the Casin walltherewithand the pad of the head 12 eing secured in position thereonv,by a .socket 19 seated u on'the inner face thereof and secured to t ehead by contact bolts 20 which are extended through and hushed from thehead. The vhead 12 has a flange 21 in surroundin relation `to thesecontact' bolts and u on .t l e free edge of this flange is seatedl acosure plate 22 apertured for the passage of a lead cord 23. The headsare connected to one another to clamp upon the ends of the casing bymeans of stay bolts 24, one of which passes through the free ends of theears 16 and intermediate these ears has mounted thereon a handle 27 bymeans of which the casing may be manipulated.

The head 11 has an .outlet o ening 28 in which is mounted anozzle 29 wli12 has an inlet opening 30 with which is engaged a control valve 31 forcontrolling the supply to the heating chamber 32 formed 'by thecombination of the casing and heads.

The outlet 28 and inlet 30 are arranged at opposite sides oftheirrespective heads, so that air passing from the inlet to the outlet mustpass over a heating element 33 disposed within the chamber and mountedwith in the socket. This heating element may be any of the electricresistance units now commonly sold upon the market.

.In the use of the device, the air assing through the chamber isconsiderably cated, and this heatin blast directed upon congealed greasebot softens the same and tends to separate it from the surface uponwhich it is a plied. This renders the device particular y applicable incleaning exposed surfaces prior to regreasing or repairing the same. Indrainin a transmission or differential, the lnozz e may be inserted inthe filling opening thereof after removing the drain plug and theincoming heated air will ile the head vso serve to liquefy the grease,tending to permit it to flow while the 'et of airv will assist inforcing the softened lubricant from the case.

Since the construction hereinbefore set forth is capable ofa certainrange of change and modification without materially departing from thespirit of the invention, I do not limit myself to such specificstructure except as hereinafter claimed.

I claim v v 1. -In combination, a casing having a cylindrical wall. andheads abutting opposite ends 0f said Wall to close the same, lsaid headsbe-r ing each provided with outstanding ears, stay bolts connecting theheads, one of said stay bolts being passed through the ears, a handle ssurrounding said stay bolt between the ears, a heating element arrangedwithin the casing, a nozzle communicating with one end of the casing,and means for introducing air under pressure to the casing to theopposite end thereof.

2. In combination, a casing having a cylindrical wall .and headsabutting opposite ends of said wall to close the same, said heads beingeach provided With outstanding ears, stay bolts connecting the heads,one of said stay bolts being passed through the ears, a handlesurrounding said stay bolt between the ears, a heating element arrangedwithin the casing, a nozzle communicating with one end of the casing,means for introducingair under pressure to the casing to the oppositeend thereof, said heads having sockets receiving the ends oi thccylindrical wall, and heat insulating pads disposed within said socketsand retained in position therein by said cylindrical Wall. 3. Incombination, a casing having a cylindrical wall and heads abuttingopposite ends ot' said wall to close the same, said heads being eachprovided with outstanding ears, stay bolts connecting the heads, one ofsaid stay bolts being passed through the ears, a handle surrounding saidstay bolt between the ears, a heating element arranged Within the casthecasing, and means for introducing air ing, a nozzle communicating Withone end of under pressure to the casing to the opposite end thereof,said cylindrical Wall comprising inner and outer metallic shells and aninterposed heat insulation.

4. In combination, a casing having a cylindrical wall and heads abuttingopposite ends of said Wall to close the same, said heads being` eachprovided with outstanding ears, stay bolts connecting the heads, one oi'said stay bolts being passed through the ears, a handle surrounding saidstay bolt between the ears, a heating element arranged within thecasing, a nozzle communicating with one end of the casing, means orintroducing air under pressure to the casing to the opposite endthereof, said heads having sockets receiving the ends of the cylindricalwall, and heat insulating pads disposed Within said sockets and retainedin position therein by said cylindrical Wall, said cylindrical wallcomprising inner and outer metallic shells and an interposed heatinsulation.

5. An air heating apparatus comprising a portable casing having a headprovided with an inlet and a head provided with an outlet, an electricalheating element within the casing, a support for said element, boltssecuring the support to one of said heads, the bolts passing through thehead and connected to the heating element, a iiange carried by said headin surrounding relation to the outer ends of the bolts, and an aperturedclosure plate secured to the flange.

Intestimony whereof I hereunto aiix my signature.

LLOYD A. DERBY.

